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Texas Instruments LP3871ES-2.5/NOPB
- Part No.:
- LP3871ES-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LP3871ES-2.5/NOPB.pdf
- Description:
- IC REG LINEAR 2.5V 800MA DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:185
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Product details
Overview
LP3871ES-2.5/NOPB from Texas Instruments is a 0.8-A ultra-low-dropout linear regulator in SOT-223 package, delivering fixed 2.5 V output with ±1.5% accuracy at room temperature, 24 mV typical dropout at 80 mA, and 10 nA shutdown quiescent current. It serves as a primary power supply for low-voltage microprocessors and GTL bus terminators where fast transient response and minimal input-output differential are critical.
For engineers reviewing the LP3871ES-2.5/NOPB datasheet, LP3871ES-2.5/NOPB pinout, LP3871ES-2.5/NOPB application, or LP3871ES-2.5/NOPB equivalent, key selection criteria include verified 2.5 V output stability under 0.8-A load, ERROR flag functionality for undervoltage detection, thermal performance up to +125°C junction, and compatibility with 10 µF tantalum output capacitors per TI SNVS225H.
Technical Context
The LP3871ES-2.5/NOPB uses a CMOS-based PMOS pass transistor architecture enabling ultra-low dropout and load-independent quiescent current. Its internal error amplifier drives the pass element with high gain and bandwidth, achieving rapid load-step response-critical for microprocessor core rails experiencing dynamic current bursts.
It integrates an open-drain ERROR flag comparator monitoring output voltage against a 10% threshold with 5% hysteresis, and features active shutdown control via a logic-level SD pin requiring external 10-kΩ pullup. No SENSE pin is present-voltage regulation is referenced solely to the OUT pin, distinguishing it from the LP3874 variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V, ±1.5% accuracy at 25°C ensures stable core bias for 2.5 V logic families without external feedback. |
| Max Output Current | 0.8 A DC continuous-supports single-core microprocessors or multiple low-power peripherals on one rail. |
| Dropout Voltage | 240 mV at 0.8 A load-enables operation from 2.75 V input when powering 2.5 V loads, minimizing wasted headroom. |
| Quiescent Current | 10 nA in shutdown mode-reduces battery drain in always-on systems such as RTC backup or sensor wake-up circuits. |
| Ground Pin Current | 6 mA at 0.8 A load-low parasitic current improves efficiency and eases thermal design vs. bipolar LDOs. |
| Load Regulation | 0.04% over 10 mA–0.8 A-maintains tight voltage tolerance across full load range, critical for precision analog interfaces. |
| Operating Temp | −40°C to +125°C junction-qualified for industrial and automotive under-hood applications without derating. |
Pinout & Package
SOT-223 (5-pin) package with exposed thermal pad on bottom; body size 6.50 mm × 3.56 mm; pin 1 = SD, pin 2 = IN, pin 3 = OUT, pin 4 = ERROR, pin 5 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SD) | Shutdown control input | CMOS-compatible active-low enable; requires 10-kΩ pullup to VIN for reliable startup and noise immunity. |
| 2 (IN) | Input voltage supply | Accepts 2.5 V–7 V; internal PMOS pass device source connects here-reverse current path exists via body diode. |
| 3 (OUT) | Regulated output | Delivers 2.5 V to load; voltage regulation referenced directly to this pin-no remote sense capability. |
| 4 (ERROR) | Open-drain fault indicator | Asserts low when VOUT drops >10% below nominal; requires external pullup; disabled during shutdown. |
| 5 (GND) | Power ground reference | Common return for IN, OUT, SD, and ERROR; must be low-impedance connection to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 24 mV typical at 80 mA enables use with single-cell Li-ion (3.0 V min) or 3.3 V rails down to 2.5 V loads. |
| Fast transient response | CMOS architecture and optimized compensation deliver <10 µs recovery from 50% load steps-prevents microprocessor brownouts. |
| Integrated protection | Thermal shutdown and short-circuit current limiting (2.3 A peak) prevent damage during fault conditions without external circuitry. |
| Low-noise operation | 150 µVRMS output noise (10 Hz–100 kHz) supports noise-sensitive analog circuits like ADC references or RF bias rails. |
| High PSRR | 73 dB ripple rejection at 120 Hz allows clean 2.5 V output even when powered from noisy switcher-derived 3.3 V supplies. |
Applications
| Microprocessor Core Supply | GTL Bus Termination |
|---|---|
Use Scenario: Powers 2.5 V I/O cores of legacy x86 or DSP processors during burst-mode execution with rapid current transients. IC Role / Device Role / Timing Role: Primary voltage regulator providing stable 2.5 V rail; ERROR flag signals undervoltage to processor reset controller. Use Value: 240 mV dropout at 0.8 A ensures operation from 2.75 V input, preserving battery life in portable test equipment. | Use Scenario: Terminates GTL (Gunning Transceiver Logic) buses in server memory subsystems requiring precise 1.2 V–2.5 V termination voltages. IC Role / Device Role / Timing Role: Fixed 2.5 V termination supply; low ground current minimizes common-impedance coupling between data and termination paths. Use Value: 0.04% load regulation maintains <±1 mV variation across full 0–0.8 A termination current range, ensuring signal integrity. |
| SCSI Terminator Power | Battery-Powered Instrumentation |
Use Scenario: Supplies regulated 2.5 V to active SCSI-2/3 terminator networks in rack-mounted storage controllers. IC Role / Device Role / Timing Role: Dedicated termination rail generator; ERROR flag disables bus drivers if output sags due to aging capacitors or cold temperature drift. Use Value: −40°C to +125°C operation guarantees reliability across storage enclosure thermal zones without derating. | Use Scenario: Powers low-power data loggers using coin-cell batteries where standby current must be minimized. IC Role / Device Role / Timing Role: Main system regulator with shutdown mode activated between measurement cycles; 10 nA IQ extends battery life beyond 10 years. Use Value: Shutdown mode reduces total system quiescent current to sub-µA level-critical for multi-year unattended deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS76325QDBVRQ1 | 0.15-A max output, 120 mV dropout at 150 mA, automotive-grade (−40°C to +125°C), no ERROR flag | Limited to low-current sensors or interface ICs-not suitable for 0.8-A microprocessor loads | Select only for space-constrained automotive modules needing AEC-Q100 qualification and lower cost at <150 mA. |
| MCP1703T-2502E/MB | 0.25-A max output, 600 mV dropout at 250 mA, 2.5 µA quiescent current in active mode, no shutdown | Higher dropout and lower current limit restrict use to always-on low-power peripherals | Choose when ultra-low active IQ matters more than output current or dropout-e.g., real-time clock backup rails. |
Compared with LP3871ES-2.5/NOPB, TPS76325QDBVRQ1 offers automotive qualification but lacks both current capability and fault signaling; MCP1703T-2502E/MB provides lower active IQ but cannot support 0.8-A loads or enable/disable control-making LP3871ES-2.5/NOPB the sole choice for high-current, fault-aware 2.5 V regulation in industrial designs.
Availability
LP3871ES-2.5/NOPB is available at Aetrix Electronics and suitable for microprocessor core supplies, GTL bus terminators, and SCSI termination circuits requiring stable component supply, long-lifecycle availability, and guaranteed parametric compliance per TI SNVS225H.
Supply support for LP3871ES-2.5/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company designing analog ICs, embedded processors, and digital signal solutions for industrial, automotive, and communications markets.
The LP387x series was developed to address demand for high-current, ultra-low-dropout regulators in battery-powered and thermally constrained systems-emphasizing fast transient response, low IQ shutdown, and robust protection for mission-critical power rails.
FAQ
What is the minimum input voltage required for LP3871ES-2.5/NOPB to regulate 2.5 V output?
The LP3871ES-2.5/NOPB requires a minimum input voltage of 2.5 V, but stable regulation demands VIN ≥ VOUT + VDROPOUT. At 0.8 A load, dropout is 240 mV, so minimum functional input is 2.74 V. The datasheet specifies 2.5 V as absolute minimum survival rating-not operational guarantee.
Does LP3871ES-2.5/NOPB support remote voltage sensing?
No, LP3871ES-2.5/NOPB does not support remote sensing. It regulates voltage at the OUT pin only. The SENSE pin is exclusive to the LP3874 variant. For remote load regulation, LP3871ES-2.5/NOPB users must minimize PCB trace resistance between OUT and load or select LP3874-2.5/NOPB instead.
How does the ERROR flag on LP3871ES-2.5/NOPB behave during shutdown?
When the SD pin is pulled low, the LP3871ES-2.5/NOPB enters shutdown mode and the ERROR flag becomes invalid-its state is undefined and should not be monitored. The flag resumes normal operation only after SD returns high and the device completes its 25 µs turn-on delay.
What output capacitor types are recommended for LP3871ES-2.5/NOPB?
Tantalum capacitors are recommended for LP3871ES-2.5/NOPB output stabilization, with 10 µF minimum capacitance and ESR between 100 mΩ and 4 Ω. Ceramic capacitors may be used if X7R/X5R dielectric is selected and voltage derating applied-Z5U/Y5V types are unsuitable due to severe capacitance loss at bias.
Is LP3871ES-2.5/NOPB RoHS compliant and lead-free?
Yes, LP3871ES-2.5/NOPB is RoHS compliant and lead-free. The "/NOPB" suffix explicitly denotes lead-free packaging per TI's product nomenclature, and the device meets JEDEC J-STD-609 Category 1 requirements for homogeneous material lead content ≤1000 ppm.
LP3871ES-2.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 7V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.35V @ 800mA
- Current - Output:
- 800mA
- Current - Quiescent (Iq):
- 5 mA
- Current - Supply (Max):
- 15 mA
- PSRR:
- 73dB ~ 57dB (120Hz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
LP3871ES-2.5/NOPB FAQ
1.How can I place an order for LP3871ES-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3871ES-2.5/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LP3871ES-2.5/NOPB reliable?
The price and inventory of LP3871ES-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3871ES-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LP3871ES-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3871ES-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3871ES-2.5/NOPB?
LP3871ES-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3871ES-2.5/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LP3871ES-2.5/NOPB?
For technical support, including LP3871ES-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3871ES-2.5/NOPB requirements.
6.How does Aetrix verify that LP3871ES-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3871ES-2.5/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LP3871ES-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LP3871ES-2.5/NOPB?
All LP3871ES-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3871ES-2.5/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LP3871ES-2.5/NOPB part is unused and in its original packaging.
Return procedure for LP3871ES-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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